convert unix epoch time to Excel time

unix2excel-time

#!/usr/bin/env python
#
# Read a CSV file from STDIN, assume the 1st column is unix-seconds
# convert it to excel time value ( (UNIXSEC + 32400) / 86400 + 25569 )
# and insert it as 2nd column
#
import sys

for line in sys.stdin.readlines():
    (unixsec_str, delim, rest) = line.partition(',')
    exceltime = (int(unixsec_str) + 32400.0) / 86400.0 + 25569.0
    print "%s,%f,%s" % (unixsec_str, exceltime, rest.rstrip('\n'))